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Has the head been warped hence re-surfaced? More than once? Top of head may be warped too. Surfacing the head takes care of the mate to block but the top end of the head may be too warped. That can bind the camshaft and rocker shaft assy.

Synchros if they have some life left (gap of 1/32" or more) are worth saving. Not much else inside is worth saving except shift forks, if not overly worn, and the sliders that the shift forks move if they are not banged up on front and back edges.

How many teeth on gear
I may have one

I drive pilot as far as it will go. Every crankshaft I have messed with is that way

You can remove the reverse pin and see if the slot the pin fits into is centered on the hole

Wet/dry sandpaper glued to tablesaw top works too. As long as it’s flat. I sprinkle water on sandpaper

I recently went to local bicycle/key/lock shop and they made keys for me copying old one.
I have also done the passenger door lock number thing. It’s easy to remove door panel with common flat tip screw driver. Use old tee shirt to snag handle clip loose. Phillips screwdriver for three other screws

Is it stock carb or Weber?

Maybe it’s the rear axel bearing
It’s easy enough to pull axles
Cup bearing in hand and spin shaft
Should be silent and smooth

It’s not worth rebuilding rear diff
Just find a replacement

Rebuilding a diff is complicated
Having someone do it is expensive
It’s better to find a replacement
Used one

My experience with Petros like method MR2 brake upgrade for 1983-88 Toyota Tercel July 2023 After driving a Tercel with the Petros MR2 front brake upgrade I was so impressed I decided to try it on my 1987 Tercel. Its brakes could not make the car skid like the upgrade does. I ordered the calipers/br...

The primary butterfly on stock carb will wear on forward side causing it to hang up sometimes not allowing return to low idle. i add extra spring for this.

Quick and fairly easy way to boost engine power is to change the main primary jet on stock carb.
Stock is usually 101 or 103. Put a 106 in there and you will notice an increase in power and a 5 mpg decrease in mpg.

My friends Tercel sits for months at a time. Fuel pump goes bad. I suspect the Ethanol messes up the pump. I wonder if fuel stabilizer would help stop that?

I use screw in compression tester that has two sets of threads on end for both thread sizes. Each size thread has an “o” ring. Been using it for 20 years and never had a problem unscrewing it. I prefer it cause I work alone and do not need to find someone to turn the key while holding it in place. I...